How do weights in a weighted chance system correlate to the odds of getting the specified prize/item?

I want to know what are the odds of getting a specific item in a weighted chance system . For example: if there’s an item with 0.1 weight, what are the odds that it will be selected.
I don’t really know how to calculate this (if there even is a way to do it).
I couldn’t find posts mentioning this exact problem.

Add up all the weights, then divide the item that you want to calculate weight by the total. Then multiply by 100 to get the % odds

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